Expression Media can't see .NRW files from a P7800

I just purchased a Coolpix P7800 for travel (I normally shoot a D300 or D7100 DSLR). I use a Mac (Yosemite) and Expression Media (EM) for cataloguing. I notice that the P7800's .NRW files are not seen by EM. They don't even appear as "this file is not recognizable" icons; they're just not there at all. Yes, I know Expression Media was discontinued when PO bought it in 2011, but the software does recognize my D7100's NEF files (after I downloaded Apple's Digital Camera Raw update). And of course Apple Photos and Aperture recognize the NRW files just fine.

NRWs have been around for many years (certainly when EM was still being supported). The D7100 was released in February 2013. The P7800 in September 2013 -- both long after EM was bought by PO -- so why does EM recognize D7100 NEFs perfectly fine but can't even see the P7800's NRWs at all?